I was going to talk about a certain anthology, but seeing as I won't be seeing payment for 90 business days after publication, I thought I'd share a Youtube video essay instead, along with other examples of non-Lovecraftian cosmic horror. Because wouldn't you know, the sub-genre cosmic horror has existed before Lovecraft, and continues to evolve to this day.
I stumbled on this video by Orogeny Vexrede, which eerily reflected some thoughts I was having, wondering why tentacles were so strongly associated with Lovecraft, and by extension, cosmic horror, when Lovecraft hardly wrote about tentacles. Aside from the Elder Things and Cthulhu, the way Lovecraft writes about his cosmic beings is quite vague, actually. The video essay does a good job discussing cosmic horror, both Lovecraft's and beyond Lovecraft, and the overused motif of tentacles.
And speaking of beyond Lovecraft, here are some examples of cosmic horror without the tentacles, all free to read online! (Isn't the public domain great?) Because the true essence of cosmic horror is the dreaded sense that humans aren't special, that we are in fact very, very, very insignificant in the grand scheme of things.
The House on the Borderlands by William Hope Hodgson
The King in Yellow by Robert W. Chambers
The Willows by Algernon Blackwood
The Seven Geases by Clark Ashton Smith
Enjoy! And Happy Spooky Month!